Abstract: To establish a method for the determination of 18 phthalic acid esters in liquor by gas chromatography-mass spectrometry, the samples were subjected to pretreatment such as vortex, centrifugation and n-hexane extraction, and separated by MEGA-5 chromatographic column. The multiion monitoring scanning mode（MRM）was used to determine the content of 18 phthalate esters in liquor by qualitative analysis of fragment abundance ratio and quantitative analysis by external standard method. The results showed that the linear relationship between peak area and concentration in a given standard solution concentration range was good, and the correlation coefficient was 0.994 0~0.999 8. The detection limit of dinonyl phthalate（DINP）was 3.0 mg/kg, and the detection limits of the other 17 phthalate esters were 0.1~0.2 mg/kg. The average recovery was 70%~130%, and the relative standard deviation was less than 10%. Among 36 samples, one or several phthalic acid esters were detected, and the detection rate of di-n-butyl phthalate （DBP） was the highest （47.2%）. This method had the advantages of high sensitivity, good repeatability and fast detection speed, which could be used for the detection of phthalate in liquor.

Key words: liquor, phthalic acid ester, plasticizer, gas chromatography-tandem mass spectrometry